diff --git a/agent-container.py b/agent-container.py
index ba76ea3..4bc8eb4 100755
--- a/agent-container.py
+++ b/agent-container.py
@@ -243,13 +243,20 @@ class AgentContainer:
                 f"Installing {tool} into the container home "
                 "(official installer, no sudo)..."
             )
-            subprocess.run(
-                [
-                    "docker", "exec", self.container_name, "bash", "-lc",
-                    spec["install"],
-                ],
-                check=True,
-            )
+            try:
+                subprocess.run(
+                    [
+                        "docker", "exec", self.container_name, "bash", "-lc",
+                        spec["install"],
+                    ],
+                    check=True,
+                )
+            except subprocess.CalledProcessError as e:
+                logger.error(
+                    f"Installing {tool} failed with exit status "
+                    f"{e.returncode}; see the installer output above."
+                )
+                sys.exit(1)
         paths = spec["path"] if isinstance(spec["path"], list) else [spec["path"]]
         for path_expr in paths:
             self._ensure_path_entry(path_expr)